Someone impersonating you to an AT&T or Verizon employee isn’t the only thing you need to worry about. Meet Signaling System 7, a hacker’s best friend.
Last spring, Dena Haritos Tsamitis left a work meeting to discover she was unable to get a signal on her cellphone. Even after rebooting the device, she couldn’t get service, leaving her unable to contact her college student daughter, who usually communicated with her throughout the day.